Being hip to PR is certainly part of the job description for NASA astronauts, but some are especially social media-savvy. Take fresh ISS resident Gregory "Reid" Wiseman: the man knows he's in a privileged position to take photos and videos, and holy crap has he shared. Via Twitter, Reid has provided nearly 500 stunning images of Earth, the ISS, his fellow astronauts and even a prosaic toilet repair -- sorry, space toilet repair. Wiseman was also the first astronaut to post a Vine in space, and has so far posted subjects like a massive lightning storm over Texas and the sun going around in a circle and never setting. Wiseman isn't quite as chatty as Canadian colleague Chris Hadfield yet, but he's only been aboard for 45 days. Anyway, if we had his view (as shown in the gallery and Vines below), we'd be speechless too.